The advance of Army Group South was the slowest of the three Army Groups mainly because of its high infantry to motorized elements ratio. The Army Group, commanded by Gerd von Rundstedt, had the largest frontage of the whole eastern front. Made aware by aviation reconnaissance reports of a weak point in enemy lines, von Rundstedt threw PanzerGruppe von Kleist into this less defended area, between Kiev and Uman. The armored spearheads of the Cavalry Brigades acted as probes. Just before a village beyond the Szod river, a detachment of 2nd Cavalry Brigade was targeted by an artillery emplacement on nearby hills overlooking the river crossing. Pausing only to regroup and call in a Nebeltruppen battery, the horsemen charged the heights.